Radiation source control method and quick-pass type security inspection system

The invention discloses a radiation source control method, which comprises the following steps: acquiring a detector signal by a radiation beam detector after the radiation source starts emitting a first radiation beam to scan the detected object; carrying out image recognition processing on the detector signal through an image recognition algorithm to detect whether the current scanning position is the boundary position of the detected object; and when the current scanning position is detected to be the boundary position of the detected object, controlling the radiation source to start emitting a second radiation beam. The invention also discloses a quick-pass type security inspection system. The invention can accurately and quickly judge the boundary position of the vehicle cab and the goods area.